LeetCode 112 Minimum Depth of Binary Tree

阿新 • • 發佈：2018-06-29

bin scrip etc turn clas question roo urn 題目

Given a binary tree, find its minimum depth.

The minimum depth is the number of nodes along the shortest path from the root node down to the nearest leaf node.

Note: A leaf is a node with no children.

Example:

Given binary tree [3,9,20,null,null,15,7],

return its minimum depth = 2.

求最小的深度，二叉樹，這道題目我認為數據是有問題的，所以有176個踩，

c++

class Solution {
public:
    int minDepth(TreeNode* root) {
        if(root==NULL) return 0;
        int lmin =0;
        int rmin =0;
        if(root->left!=NULL)
         lmin = minDepth(root->left);
        if(root->right!=NULL)
         rmin = minDepth(root->right);
        if(lmin==0 
)
            return rmin+1;
        if(rmin==0)
            return lmin+1;
        return min(lmin,rmin)+1;
        
        
        
        
    }
};

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